There is no latest AGP bus. The most recent bus designed for high performance equipment is PCI-E. And x16 has the highest bandwidth.
32 bit
PCI Express
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Video Card
PCI-E
The IDE drive has no direct correlation to the AGP bus.
The PCI Express x16 is intended to ultimately replace the AGP bus along with the PCI-X and the Conventional PCI.
PCI Express 2.0 x 16 is the Fastest But PCI Express x16 is faster than AGP
AGP is an older video card specification that had a higher bus speed than the PCI spec.
32 bit
PCI, and AGP